Annual report pursuant to Section 13 and 15(d)

Financial Instruments (Details) (Narrative)

v3.3.1.900
Financial Instruments (Details) (Narrative) - Fair value, inputs, level 1 - USD ($)
$ in Millions
Dec. 26, 2015
Dec. 27, 2014
Money Market Funds    
Schedule of Investments [Line Items]    
Available-for-sale securities pledged as collateral $ 1 $ 10
Mutual Funds    
Schedule of Investments [Line Items]    
Restricted investments $ 15 $ 16